Journal of Korea Foundry Society (한국주조공학회지)

Korea Foundry Society (한국주조공학회)
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Effects of Iron and Silicon Additions on the Microstructures and Mechanical Properties of Aluminium Bronze

알루미늄 청동의 미세조직과 기계적 성질에 미치는 Fe 및 Si 첨가의 영향

  • Kim, Jee-Hwan (Department of Materials System Engineering, Pukyong National University) ;
  • Kim, Ji-Tae (Samyoung M-Tek Co., Ltd) ;
  • Kim, Jin-Han (Gyeongnam Regional Office of SMBA) ;
  • Park, Heung-Il (Department of Materials System Engineering, Pukyong National University) ;
  • Kim, Sung-Gyoo (Department of Materials System Engineering, Pukyong National University)
  • 김지환 (부경대학교 신소재시스템공학과) ;
  • 김지태 (삼영엠텍(주)) ;
  • 김진한 (경남지방중소기업청) ;
  • 박흥일 (부경대학교 신소재시스템공학과) ;
  • 김성규 (부경대학교 신소재시스템공학과)
  • Received : 2016.08.04
  • Accepted : 2016.11.29
  • Published : 2016.12.09
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Abstract

The effects of Fe and Si additions on the microstructures and mechanical properties of aluminum bronze have been investigated. In a bar-type specimen cast in a die mold, the addition of Fe promoted the dendritic solidification of the ${\alpha}$ phase. The hardness values increased slightly in the Fe-added specimen with heat treatment, while these values was increased significantly in the specimens with Si or with combined additions of Fe and Si. When a centrifugal casting bush with combined addition of Fe and Si was heat treated, the FeSi compound within the matrix was finely dispersed, and was observed to be the origin of cup-cone type conical dimple failure in the tensile fracture surface. The mechanical properties of the heat treated centrifugal casting bushes, whose nominal alloy compositions were (Cu-7.0Al-0.8Fe-3.0Si)wt%, exhibited tensile strength of $703-781N/mm^2$, elongation of 6.6-11.7% and hardness of Hv 222.6-249.2. These high values of strength and elongation were attributed to the strengthening of the matrix due to the combined addition of Fe and Si, and to precipitation of fine the FeSi compound.

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References

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